Portion of a watch case



FIG. 1 is a front elevational view of a portion of a watch case, showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a front, bottom and right side perspective view thereof; and,

FIG. 8 is a vertical cross-sectional view thereof, taken along a line crossing a central portion of the watch case.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of a watch case, as shown and described. 